Apart from one spellingmistake ('Deinstaleren' has to be 'Deinstalleren' or even preferable 'Deïnstalleren') the translations were exactly as I had made them. I did not upload the file because I had to convince myself first that somebody did not upload dutch translations before.

Well, obviously now Zurga did. Thanks Zurga

Stupid mistake :P. I changed it to Deinstalleren, beacause i don't know how the plugin handles special characters. Here is the updated Dutch translation

It's definitely the koboplugins.ini. and Kobo.tgz.that I'm manually moving to the .kobo folder, and it seems to install OK insofar that I get the updating screen once I unplug...it's just not firing up properly once I go in to a book and exit out of it...all very strange.

I don't want to pollute this thread with repeated requests for help, but will update if I make any progress from my side and can be of any assistance for anyone else with the same issue.

Sorry to hear you haven't got it working. It indeed does sound like it's installing properly. Very strange!

just tested the new "japanese" firmware 2.2.0 on my kobo glo. I live in germany and so I use the german setting. After updating to 2.2.0, i now have a german "Kobo Glo". No more "Kobo Blo"! I don't if it was only a german mis-translating.

I think, this will be displayed in any other language the kobo glo uses.
Then I edited the koboplugins.ini with "compatFirmware=2.2.0". But to use the plugin I had to put the kobo.tgz inthe .kobo folder again.
Nothing (using of plugin) has changed, but now everything is "up to date"!!